After meeting eligibility criteria, male and female subjects will be randomized to either receive GSK962040 (50 milligram [mg]) once daily (OD) via naso-gastric (NG) or orogastric (OG) feeding tube (oral solution), or placebo by the same route. If subjects develop intolerance to enteral feeding at any point up to Dose 5 of study medication (inclusive), study treatments will switch such that those originally receiving GSK962040 will receive metoclopramide (10 mg, intravenous [iv], every 6 hours) and those subjects originally randomized to receive placebo will receive GSK962040 (50 mg, via NG, OD). Additionally, if subjects develop intolerance prior to any treatment, they will be randomized to receive either GSK962040 (50 mg, via NG, OD) or metoclopramide (10 mg, iv, every 6 hours).